sql - Update ignore unique constraint key if the valeu is already on the table. - ORACLE -


i have oracle command.

update table_numbers set mdn = concat(concat(substr(mdn,1,2),`9`,substr(mdn,3,9)) mdn `8%` , length(mdn)=10;

i have put number 9 on 3 position if number start 8 , have 10 digits.

let's suppose have 8187412868, 81987412868.

but 81987412868 , 8187412868 on table.

in case there no need update or remove, ignore unique constraint error execute whole query.

like 

    if (concat(concat(subsrtr(mdn,1,2),`9`,substr(mdn,3,9))     mdn `8%` , lenght(mdn)=10)     on table, ignore     else     execute....

you use exists operator pre-check if value exits (also, note fixes brackets , typos in op's query):

update table_numbers set    mdn = concat(concat(substr(mdn, 1, 2), '9') ,substr(mdn, 3, 9))  mdn '8%' ,         length(mdn) = 10 ,        not exists (select *                      table_numbers b                     a.mdn = concat(concat(substr(b.mdn, 1, 2),                                                  '9'),                                           substr(b.mdn, 3, 9))

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